"We use this mode for example when we play over a secondary dominant of the IIm of a major key or when we play a secondary dominant of the IIIm of a major scale."

Hi Berko, we could use this scale in both cases.

The secundary dominant is the fifth chord (Major chord with minor seventh) by any chord of the scale . The seventh grade of a major scale has no dominant because the seventh grade is not a stable chord.

The first chord of a major scale has no secundary dominant because this chord have a naturaly dominant( the fifth grade of the scale)

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Hi GMC! Welcome to this new lesson. Today we will talk about the myxolidian b9b13. This mode is composed by the root, minor second, minor third, major third, just fourth, just fifth, minor sixth and minor seventh.

The myxolidian b9b13 has even more tension than the myxolidian. If we play this scale we have, for example, the minor second (9ºb, Ab) that will be resolve to the fifth of the next chord, we have the minor sixth (13º b Eb) that will be resolve to the third or to the ninth of the next chord, don´t forget the third (the note B) that will be resolve to the Root of the next chord and the seventh that will be resolve to the third of the next chord.

We use this mode for example when we play over a secondary dominant of the IIm of a major key or when we play a secondary dominant of the IIIm of a major scale.